T $08-27$ The equation for the noise reduction ratio $($NRR$)$ is given as NRR$===$ Assuming a causal and stable system with a rational system function, show that the NRR is bounded by NRR$-$ C $1-$Pmax $,$ where p max is the pole of maximum magnitude and C is a constant that depends on the partial fraction coefficients. You may assume that the order of the numerator in H$($z$)$ does not exceed the order of the denominator such that h$=$Apu$($n$).$